Good luck, I hope you find a team! You don't need to know a lot to start; they will teach you.
Your value to them is not your sailing ability!
As the new, inexperienced person on the team, you are valuable if you sit where they tell you to sit - the boat goes faster if the weight is distributed just so. You are valuable if you say "I will be there" and then you show up (at the right time), every single time. The race starts whether they are at the starting line or not; once they leave the dock it's really hard to pick up new crew members. If you can manage those two things, you are really, really valuable if you pay attention, learn, and ask good questions.
